{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical"], "input": "ETHNOPHARMACOLOGICAL RELEVANCE : To evaluate the antiprotozoal activity and cytotoxicity of extracts and fractions from the leaves , root bark and stem bark of Alstonia congensis ( Apocynaceae ) , used in traditional medicine against parasitic diseases ."}
{"Chemical": []}